To use this heart beat counter, just put your finger on the phone's camera and stay still, the heart rate is shown after few seconds. Covering a part of flash may help heart beat counter to become even more accurate.

What are heart rate training zones?

Heart rate training zones are calculated using maximum heart Rate (MaxHR). Within each training zone, subtle physiological effects take place to enhance your fitness. We have similar definition to those used in Fitbit trackers:

REST ZONE (up to 50% HRmax): This considers as resting zone.

FAT BURN ZONE (50 to 70% of maximum): Recovery and warming up exercises should be completed at this zone. It’s called the fat burn zone because a higher percentage of calories are burnt from fat.

CARDIO ZONE (70% to 85% of HRmax): Most of the main exercise should be completed in this zone.

PEAK ZONE (greater than 85% of HRmax): This zone is ideal for short intense sessions (high intensity interval training HIIT) to improve performance and speed.